A Body Windshield Wiper

I am restoring a 1973 Duster. While installing a replacement dash I noticed that one of the windshield wiper rods, below the dash, was hanging loose. It appears that some sort of attachment bushing is missing. Does anybody know where I can find a replacement? Is there an exploded view of the wiper assembly so that I can correctly identify this part?
Thanks
Author: tobacjones